First off, the Nook will need to be registered to the same Adobe Digital Editions account that your Sony is linked to if you wish to share.
Second, The Nook can read ebooks purchased from Sony but your Sony Reader cannot read ebooks purchased through Barnes and Noble. B&N ePubs use a different DRM scheme that only Nooks can read, but the Nook can also read the DRM that Sony and all other retailers use.
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